Measuring chain diffusion coefficients and activation energy during coalescence of fluorescence-labeled hard latex particles

M. Canpolat, Ö. Pekcan
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引用次数: 1

Abstract

The steady-state fluorescence (SSF) technique was used to study interdiffusion of polymer chains across the particle–particle junction during film formation from hard latex particles. The latex films were prepared from pyrene (P) and naphthalene (N) labeled poly(methyl methacrylate) (PMMA) particles and annealed for long time intervals above the glass transition temperature (Tg) between 170 and 220°C. A novel correction method was suggested and employed to eliminate changing of the optical density of latex films after such annealing processes. P and N fluorescence intensities solely from the energy-transfer processes were monitored versus annealing time and were used to measure the polymer chain diffusion coefficients Dp and DN, which were found to be between 4.34 × 10–14 and 7.68 × 10–13 cm2/s for an annealing temperature between 170 and 220°C. Using these diffusion coefficients with the Arrhenius relation, the diffusion activation energy for the polymer backbone was found to be 28 kcal/mol.

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测定荧光标记硬胶乳颗粒聚并过程中的链扩散系数和活化能
采用稳态荧光(SSF)技术研究了硬乳胶颗粒形成薄膜过程中聚合物链在颗粒-颗粒交界处的相互扩散。用芘(P)和萘(N)标记的聚甲基丙烯酸甲酯(PMMA)颗粒制备乳胶膜,并在玻璃化转变温度(Tg) 170 ~ 220℃以上进行长时间退火。提出了一种新的校正方法,用于消除这种退火过程对乳胶膜光密度的影响。对能量传递过程产生的P和N荧光强度随退火时间的变化进行了监测,并用于测量聚合物链扩散系数Dp和DN,发现在170至220℃的退火温度下,其扩散系数在4.34 × 10-14和7.68 × 10-13 cm2/s之间。利用这些扩散系数和Arrhenius关系,得到聚合物主链的扩散活化能为28 kcal/mol。
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